package util.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

public class FileDownload {
	public static boolean fileDownload(String filePath, HttpServletResponse response)
			throws ServletException, IOException {
		// 处理请求
		// 读取要下载的文件
		boolean flag = false;
		File f = new File(filePath);
		if (f.exists()) {
			@SuppressWarnings("resource")
			FileInputStream fis = new FileInputStream(f);
			String filename = URLEncoder.encode(f.getName(), "utf-8"); // 解决中文文件名下载后乱码的问题
			byte[] b = new byte[fis.available()];
			fis.read(b);
			response.setCharacterEncoding("utf-8");
			response.setHeader("Content-Disposition", "attachment; filename=" + filename + "");
			// 获取响应报文输出流对象
			ServletOutputStream out = response.getOutputStream();
			// 输出
			out.write(b);
			out.flush();
			out.close();
			flag = true;
		}
		return flag;
	}
}
